Velvet Devils Food Layer Cake with Coffee Buttercream Frosting

Ingredients

• Velvet Devil’s Food Cake:
• ½ cup Natural Cocoa Powder
• 2 teaspoons instant espresso powder, or instant coffee
• 1 cup boiling water
• 2 teaspoons Vanilla Extract
• 12 tablespoons Unsalted Butter (1 ½ sticks), softened
• 1 ¼ cups granulated sugar
• 2 large eggs, at room temperature
• 1 ¼ cups Unbleached All-purpose Flour
• ½ teaspoon baking soda
• ½ teaspoon table salt
• Coffee Buttercream Frosting:
• 1 tablespoon instant espresso powder, or instant coffee
• 1 tablespoon coffee liqueur
• 1 tablespoon Vanilla Extract
• ½ pound Unsalted Butter (2 sticks), softened
• 2 cups confectioners' sugar
• 1 Egg Yolk (beaten) , or 2 tablespoons beaten egg